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[Tracking Requested - why for this release]: unintended visual regression in the primary UI
The back button's background's opacity changes when the button becomes disabled / enabled. This looks broken. Every new tab starts out with a disabled back button, so this happens all the time.
On Mac, native buttons keep their full opacity when they become disabled and only the glyph or text on top of them becomes less opaque. We should match that, and we did, until the recent changes.

The code fixes for bug 1365926 just landed, but there won't be a notification here since the bug won't be closed just yet until I wrap up the tests. You can still implement the alternative 'context-fill-opacity' based fix for this bug now though.

(In reply to Jonathan Watt [:jwatt] from comment #8)
> The code fixes for bug 1365926 just landed, but there won't be a
> notification here since the bug won't be closed just yet until I wrap up the
> tests. You can still implement the alternative 'context-fill-opacity' based
> fix for this bug now though.
Thanks!

I tested this on Windows 10x 64 with Nightly 57.0a1(2017-08-09) and the back button background changes if the button is disabled or enabled. If it's disabled it becomes grayed out. Please tell me if this is this works as intended? Thanks

(In reply to ovidiu boca[:Ovidiu] from comment #15)
> I tested this on Windows 10x 64 with Nightly 57.0a1(2017-08-09) and the back
> button background changes if the button is disabled or enabled. If it's
> disabled it becomes grayed out. Please tell me if this is this works as
> intended? Thanks
You only need to test this on 55, where the disabled back button should not look different than the one in 54.

Created attachment 8895856[details]
back button.png
Please see the attached file. This is on Mac Os X 10.10 with FF 55 and FF 54, both back buttons are disabled. From my point of view, the back button doesn't look the same, but please tell me your opinion. Thanks